Doctor of Science, Hokkaido University(Japan)

Basic analysis, Functional Analysis

Basic analysis, Mathematical Physics

2014
Shinshu University, Faculty of Science

2013 - 2014
Shinshu University, Faculty of Science

2009 - 2013
信州大学, ファイバーナノテク国際若手研究者育成拠点

2008 - 2009
学術振興会特別研究員（PD)

2007 - 2008
学術振興会特別研究員（PD)

2006 - 2007
学術振興会特別研究員（DC)

2007 - 2008, Princeton University

2004 - 2007, Hokkaido University, Faculty of Science, Mathematics

2002 - 2004, Hokkaido University, Faculty of Science, Mathematics

1998 - 2002, Gakushuin University

2024 - 2025
函数解析学分科会連絡責任評議員, MSJ

2023 - 2024
函数解析学分科会評議員, 日本数学会

Absence of embedded eigenvalues for non-local Schrödinger operators
Atsuhide Ishida, József Lőrinczi and Itaru Sasaki
Journal of Evolution Equations, 22(82), 27 Sep. 2022, Refereed

Spectrum of the semi-relativistic Pauli-Fierz model II
Takeru Hidaka, Fumio Hiroshima, Itaru Sasaki
Journal of Spectral Theory, 11(4), 1179-1830, Dec. 2021, Refereed, Not invited
Lead, Last

Explicit diagonalization of pair interaction models
Yasumichi Matsuzawa, Itaru Sasaki, Kyosuke Usami
Analysis and Mathematical Physics, 11(48), Jan. 2021, Refereed

Time operators for quantum walks
Funakawa, Daiju; Matsuzawa, Yasumichi; Sasaki, Itaru; Suzuki, Akito; Teranishi, Noriaki;
LETTERS IN MATHEMATICAL PHYSICS, 110(9), 2471-2490, Sep. 2020

Embedded eigenvalues and Neumann-Wigner potentials for relativistic Schrödinger operators
József Lőrinczi and Itaru Sasaki
15 Aug. 2017, Refereed

A mathematical analysis of dressed photon in ground state of generalized quantum Rabi model using pair theory
Masao Hirokawa, Jacob S Møller and Itaru Sasaki
05 Apr. 2017, Refereed

Essential spectrum of the discrete Laplacian on a perturbed periodic graph
Sasaki, Itaru; Suzuki, Akito;
Journal of Mathematical Analysis and Applications, 446(2), 1863-1881, 2017

Enhanced Binding of an N-particle System Interacting with a Scalar Field II. Relativistic Version
Fumio Hiroshima, Itaru Sasaki
Publications of the Research Institute for Mathematical Sciences, 51(4), 655-690, 2015

Spectral analysis of non-commutative harmonic oscillators: The lowest eigenvalue and no crossing
Hiroshima, F; Sasaki, I
Journal of Mathematical Analysis and Applications, 415(2), 595-609, 2014

Spectral Analysis of the Dirac Polaron
Itaru Sasaki
Publications of the Research Institute for Mathematical Sciences, 50(2), 307-339, 2014

Multiplicity of the lowest eigenvalue of non-commutative harmonic oscillators
Hiroshima, F; Sasaki, I
Kyushu Journal of Mathematics, 67(2), 355-366, 2013

Note on the spectrum of discrete Schrodinger operators
Fumio Hiroshima, Itaru Sasaki, Tomoyuki Shirai, Akito Suzuki
Journal of Math-for-Industry, 4(2012B-4), 105-108, 2012

Measure theoretical approach to recurrent properties for quantum dynamics
Yoshiki Otobe, Itaru Sasaki
Journal of Physics A, 44, 465209, 2011

Self-adjoint extensions of momentum operators: application of weak Weyl relations
Fumio Hiroshima, Sotaro Kuribayashi, Itaru Sasaki
Journal of Math-for-Industry, 2(2010A-3), 21-25, 2010

On the ionization energy of semi-relativistic Pauli-Fierzmodel for a single particle
Fumio Hiroshima, Itaru Sasaki
Kokyuroku Bessatsu, B21, 25-34, 2010

Enhanced binding of an $N$-particle system interacting with a scalar bose field I
Fumio Hiroshima, Itaru Sasaki
Mathematische Zeitschrift, 259(3), 657-680, 2008

Boltzmann Limit and Quasifreeness for a Homogeneous Fermi Gas in a Weakly Disordered Random Medium
Thomas Chen, Itaru Sasaki
Journal of Statistical Physics, 132(2), 329-353, 2008

Schrodinger operators with rapidly oscillating potentials
Itaru Sasaki
Integral Equations and Operator Theory, 58(4), 563-571, 2007

Stability of discrete ground state
Tadahiro Miyao, Itaru Sasaki
Hokkaido Mathematical Journal, 34(3), 2005

Ground state energy of the polaron in the relativistic quantum electrodynamics
Itaru Sasaki
Journal of Mathematical Physics, 46, 102307, 2005

Ground state of the massless Nelson model in a non-Fock representation
Itaru Sasaki
Journal of Mathematical Physics, 46, 102107, 2005

Spectral properties of a Dirac operator in the chiral quark soliton model
Itaru Sasaki
Journal of Mathematical Physics, 46, 052305, 2005

On the radius of convergence of the ground state in a pair interaction model
Itaru Sasaki
MSJ Spring Meeting 2024, 17 Mar. 2024, MSJ

対相互作用模型の対角化とその解析について
Itaru Sasaki
作用素論セミナー, 08 Dec. 2023, Invited

対相互作用模型の散乱理論について
Itaru Sasaki
MSJ Autumn Meeting 2023, 20 Sep. 2023, Not invited

Analyticity of the ground state in the pair interaction model
Itaru Sasaki
2022 RIMS Mathematical aspects of quantum fields and related topics, 18 Jan. 2023, Invited

Bogoliubov transformation and the pair interaction model
Itaru, SASAKI
Non-Commutative Probability and Related Topics 2022, 07 Nov. 2022, 北海道大学, Invited

A general theory of diagonalization by Bogoliubov transformations
佐々木　格
2022年度秋季総合分科会, 13 Sep. 2022

量子ウォークの時間作用素について
佐々木　格
時間・量子測定・準古典近似の理論と実験 〜古典論と量子論の境界〜, 23 Jul. 2022, Invited

Diagonalization of pair interaction models and ground state energies
Kyosuke Usami, Itaru Sasaki
2020 RIMS共同研究(公開型) 量子場の数理とその周辺, 09 Mar. 2021, Invited

準相対論的 Pauli-Fierz モデルの基底状態について--粒子が質量を持たない場合--
Itaru Sasaki
Workshop on Analysis in Kagurazaka 2018, 26 Jan. 2018, Invited

On the embedded eigenvalue of relativistic Schrödinger operator
Itaru Sasaki
Aarhus University, Math/Phys Seminar, 06 Dec. 2017

Embedded Eigenvalue and von Neumann-Wigner Potential for the Relativistic Schrödinger Operator
Itaru Sasaki
University of Lorraine, Spectral Theory and Mathematical Physics, 18 May 2017

Embedded Eigenvalues and Neumann-Wigner Potentials for Relativistic Schrödinger Operators
Itaru Sasaki
Physical and mathematical approaches to interacting particle systems -In honer of 70th birthday of Herbert Spohn-, 12 Jan. 2017, Invited

Embedded Eigenvalue and von Neumann-Wigner Potential for the Relativistic Schrödinger Operator
Itaru Sasaki
Mathematical Results in Quantum Physics, 10 Oct. 2016, Georgia Institute of Technology

Embedded Eigenvalues and Neumann-Wigner Potentials for Relativistic Schrödinger Operators
Itaru Sasaki
Analysis Seminar, 15 Sep. 2016, Loughborough University

相対論的シュレディンガー作用素の埋蔵固有値について
Itaru Sasaki
Mathematical Physics Seminar, 23 Mar. 2016, 北海道大学

On the embedded eigenvalue of relativistic Schrödinger operator
Itaru Sasaki
Himeji Conference on Partial Differential Equations, 03 Mar. 2016, EGRET HIMEJI 4F

相対論的シュレディンガー作用素の埋蔵固有値の構成
Itaru Sasaki
Matsuyama Analysis Seminar, 05 Feb. 2016, Ehime University

準相対論的Pauli-Fierz模型の基底状態の存在と廣川の方法について
佐々木　格
マスフォアイノベーション卓越大学院 数理物理研究会 (H60), Invited

Theory of Function Spaces
Shinshu University

Mathematical Modelling and Analysis
Shinshu University

Mathematical Modelling and Analysis
Shinshu University

Mathematical Modelling and Analysis
Shinshu University

Statistical Mechanics
Shinshu University

Calculus II
Shinshu University

Data Processing I
Shinshu University

Theory of heat and wave equations
Shinshu University

Data Processing I
Shinshu University

Theory of heat and wave equations
Shinshu University

Data Processing I
Shinshu University

Theory of heat and wave equations
Shinshu University

Calculus II
Shinshu University

Exercise in Calculus II
Shinshu University

Data Processing I
Shinshu University

Theory of heat and wave equations
Shinshu University

Classical Mechanics II
Shinshu University

Data Processing I
Shinshu University

Information Processing
Shinshu University

Thermodynamics
Shinshu University

Freshmen Seminar
Shinshu University

Calculus I
Shinshu University

Calculus II
Shinshu University

Data Processing I
Shinshu University

Information Processing
Shinshu University

Theory of heat and wave equations
Shinshu University

Partial Differential Equations and Quantum Theory
Shinshu University

Calculus I
Shinshu University

Calculus II
Shinshu University

Data Processing I
Shinshu University

Information Processing
Shinshu University

Theory of heat and wave equations
Shinshu University

Variational Calculus and Analytical Mechanics
Shinshu University

Data Processing I
Shinshu University

Information Processing
Shinshu University

Freshmen Seminar
Shinshu University

Theory of heat and wave equations
Shinshu University

Partial Differential Equations and Quantum Theory
Shinshu University

Data Processing I
Shinshu University

Information Processing
Shinshu University

Freshmen Seminar
Shinshu University

Theory of heat and wave equations
Shinshu University

Data Processing I
Shinshu University

Theory of heat and wave equations
Shinshu University

Partial Differential Equations Ⅱ
Shinshu University

Partial Differential Equations and Quantum Theory
Shinshu University

Data Processing I
Shinshu University

Data Processing I
Shinshu University

Partial Differential Equations and Quantum Theory
Shinshu University

Variational Calculus and Analytical Mechanics
Shinshu University

Partial Differential Equations and Quantum Theory
Shinshu University

Variational Calculus and Analytical Mechanics
Shinshu University

Partial Differential Equations and Quantum Theory
Shinshu University

Calculus I
Shinshu University

Calculus II
Shinshu University

Data Processing I
Shinshu University

Theory of heat and wave equations
Shinshu University

Theory of Function Spaces
Shinshu University

線形現象論
Shinshu University

International Association of Mathematical Physics

The Mathematical Society of Japan

Mathematical Physics, Spectral analysis